Add spacing to menu items
Remove post header excessive padding on desktop
Fix header about text rendering on undesired pages

The header rendering condition was wrong. The right one was applied now
Fix page header not displaying as post header

To page header to display as post headers, the post__header--single
class had to be added to the <header> wrapper
Make container bigger

The right amount of characters per line, ledding to a better experience.
Fix post file name
Update screenshot